Pressure is building on Volkswagen and German government agencies to come clean about the dieselgate scandal. Volkswagen’s second-biggest shareholder has given VW a three-month deadline to provide a full account of the scandal, while German lobby group Deutsche Umwelthilfe, frustrated because Germany's Kraftfahrt-Bundesamt (KBA) has yet to provide details about the recall of millions of affected Volkswagen diesel cars, has brought suit against the regulator.

Volkswagen promised to submit a full report on the scandal at the company’s annual shareholder meeting on April 21. Stephan Weil, prime minister of VW’s second largest shareholder and home state Lower Saxony, does not want to wait a day longer. Weil told Bloomberg in an interview:

“There is a very legitimate concern on the part of U.S. authorities, the public and the company itself for a comprehensive investigation. It’s in the interest of VW to provide a complete clarification.”

Volkswagen is not the only party that is not in a big hurry to provide full information. Customers in Europe are still in the dark about the particulars of a huge recall that was ordered three months ago. They want to know “what changes in power, fuel consumption, and emissions are involved,” the consumer protection group Deutsche Umwelthilfe said today.

For the past three months, lawyers of the group have tried to get details from the agency, only to be put off, and stalled. The DUH group brought suit at the administrative court of Schleswig, the complaint (in German) is here.

The European public also wants the KBA to come clean on the emissions tests the agency has performed on more than 50 cars of a number of automakers. According to media reports, “significant deviations” were registered, but the results remain under lock and key. According to Focus Magazine, cars of the Volkswagen Group were tested, along with cars by BMW, Ford, Opel, Fiat, Mercedes, Alfa Romeo, Dacia, Hyundai, Toyota, Mazda, and more. Apparently, the results were disclosed to automakers, because Daimler AG’s CEO Dieter Zetsche could tell Germany’s Welt newspaper:

“People of the KBA were here for two days, cars were tested. As far as I know, no undue emission readings were registered. We don’t cheat, we do not manipulate emission readings.”